char(n) default '' crashes server

Hi,

I found a bug in 6.4.2 which seems to be
related to the char(n) type and shows up
if one assigns a zero-length default value.

Here is an example:

test=> create table t1 (
test-> str1 char(2) default '', <---- note this one
test-> str2 text default '',
test-> str3 text default ''
test-> );
CREATE

test=> insert into t1 values ('aa', 'string2', 'string3');
INSERT 91278 1
test=> insert into t1 (str3) values ('string3');
INSERT 91279 1
test=>test=> select * from t1;
Backend message type 0x44 arrived while idle
Backend message type 0x44 arrived while idle
We have lost the connection to the backend, so further processing is
impossible. Terminating.

If the table is created as

create table t1 (
str1 char(2) default ' ',
str2 text default '',
str3 text default ''
);

the crash doesn't happen.

Regards
Erich